Azalea Whitefly Diagnostic Guide

Pealius azaleae

Azalea whitefly, Pealius azalea, is a common pest of azalea in the landscape. It is very similar to other whiteflies in that it lives and feeds primarily on the undersides of leaves. Whiteflies suck out the plant juices causing yellowing of leaves. They also cause a sticky sap like substance, called honeydew, to coat leaves. This honeydew can attract other insects as well as allow black sooty mold to grow on coated surfaces.

Treatment Strategy

Monitoring and catching populations early will help greatly with control efforts. Systemic insecticides are the easiest products to use to control this insect since whiteflies feed primarily on the undersides of leaves, making foliar sprays a difficult option. Begin Xytect™ applications in the fall for next season control. Early spring applications can work but you must get the product applied before nymphs emerge in May. Transtect™ applications can provide current season control, and should begin in May with the hatch of eggs.

Foliar Spray using Xytect 75WSP 22 packets

Treatment Expectations

Systemic insecticides are very effective for controlling this insect.

A Diagnostic Guide is designed to help you identify a pest issue and management solutions. Always refer to product label for all rates and approved uses. Some images courtesy forestryimages.org. Use of the images does not imply endorsement of treatments by forestryimages.org